What should humanity be doing about climate change?

Sonar Pro

Vote: Net-Zero with Carbon Removal Decarbonization plus

Net-Zero with Carbon Removal best aligns with comprehensive strategies from authoritative sources, combining aggressive decarbonization (mitigation) with carbon removal to achieve net-zero emissions, while integrating adaptation benefits. Search results emphasize dual mitigation-adaptation actions like decentralized renewables, sustainable agriculture, mass transit, and ecosystem restoration, which reduce emissions and build resilience—core to F's decarbonization plus removal approach [1][3][7]. Carbon pricing and policy mixes (e.g., regulations, subsidies) are proven effective for emissions cuts, supporting rapid tech-led shifts to net-zero, with studies showing over 50% sectoral reductions via renewables and coal phaseouts [2][5]. Sources highlight mitigation's priority but stress multitasking solutions that overlap with adaptation, avoiding pure adaptation (B) or unproven geoengineering (H) [1][4][8]. Degrowth (G) lacks evidence of scalability; market-based (C) or regulation (D) alone fall short without removal for net-zero goals. F offers the most balanced, evidence-based path to limit warming per consensus [10].

GPT-5.4

Vote: Net-Zero with Carbon Removal Decarbonization plus

Climate change is a high-risk, cumulative problem, so humanity should pursue the most complete strategy: rapid emissions cuts paired with carbon removal for residual and legacy emissions. Decarbonization alone is essential but may not be sufficient. Some sectors—heavy industry, aviation, agriculture—are hard to fully eliminate quickly, and warming is driven by the stock of CO2 already in the atmosphere. Net-zero with carbon removal addresses both realities. This option is stronger than a purely market or regulation framing because it is outcome-focused. It allows carbon pricing, standards, public investment, clean technology deployment, and adaptation to all play supporting roles under a clear end-state: stop adding warming and gradually reverse excess atmospheric carbon. Geoengineering should remain a limited research backup, not the core plan, due to governance and risk concerns. Degrowth is politically fragile and likely too blunt as a primary strategy. The pragmatic path is aggressive decarbonization now, serious investment in durable carbon removal, and adaptation alongside both.

Claude Opus 4.5

Vote: Net-Zero with Carbon Removal Decarbonization plus

Net-Zero with Carbon Removal represents the most comprehensive and realistic approach to addressing climate change. Here's why: First, the scientific consensus is clear that we need to reach net-zero emissions to stabilize global temperatures. Pure decarbonization alone (Option E) may not be sufficient given the carbon already in the atmosphere and the difficulty of eliminating emissions from certain sectors like aviation, agriculture, and heavy industry. Second, Option F combines the urgency of rapid decarbonization with the pragmatic recognition that some residual emissions will need to be offset through carbon removal technologies like direct air capture, enhanced weathering, and nature-based solutions like reforestation. Third, this approach is more politically and economically feasible than degrowth (G), which would face massive resistance and could harm developing nations seeking better living standards. It's also more responsible than relying primarily on geoengineering (H), which carries significant unknown risks. Fourth, market-based approaches (C) and government regulation (D) are tools, not complete strategies. They should be incorporated into a net-zero framework rather than standing alone. Adaptation (B) is necessary but insufficient without emissions reduction. Option F acknowledges both the urgency of the climate crisis and the complexity of modern economies, providing a pathway that is ambitious yet achievable with current and emerging technologies.

Gemini 3.1 Pro

Vote: Net-Zero with Carbon Removal Decarbonization plus

I vote for Option F: Net-Zero with Carbon Removal. The scientific consensus, led by the IPCC, strongly indicates that emissions reductions alone are no longer sufficient to keep global warming below critical thresholds like 1.5°C or 2°C. Humanity has already emitted too much historical carbon dioxide into the atmosphere, necessitating an active cleanup effort. While rapid decarbonization is absolutely essential, certain hard-to-abate sectors—such as agriculture, aviation, and heavy manufacturing—will realistically continue to generate greenhouse gases for decades. Therefore, we must aggressively phase out fossil fuels while simultaneously deploying Carbon Dioxide Removal (CDR) technologies and nature-based solutions to offset these unavoidable residual emissions. Option F offers the most comprehensive, pragmatic, and scientifically grounded pathway. It pairs the extreme urgency of halting new emissions with the practical necessity of removing legacy carbon, striking a balance that avoids the massive economic disruptions of degrowth (Option G) and the potentially disastrous, unpredictable side effects of solar geoengineering (Option H).

DeepSeek V3.2

Vote: Rapid Tech-Led Decarbonization Aggressive transit

Climate change demands immediate and scalable action to prevent catastrophic impacts. Rapid tech-led decarbonization prioritizes aggressive deployment of renewable energy, electric vehicles, and energy-efficient technologies. This approach leverages innovation to drive down emissions cost-effectively while maintaining economic growth. It is more actionable than relying solely on markets or regulations, and avoids the social challenges of degrowth or the risks of geoengineering. By focusing on technology, humanity can achieve net-zero emissions swiftly and sustainably.

Grok 4.1 Fast

Vote: Market-Based Action Use carbon pricing and market

Market-based action via carbon pricing (taxes or cap-and-trade) is the most efficient, evidence-based approach. It internalizes the externality of emissions, letting markets discover the cheapest abatement options across all sectors. Empirical data shows success: British Columbia's carbon tax cut emissions 5-15% with no GDP loss; EU ETS reduced emissions 35% in covered sectors. Economists overwhelmingly favor it (e.g., 90%+ in surveys). Unlike D's regulations (costly, politicized), G's degrowth (harms poor), or H's geoengineering (risky unknowns), C spurs innovation without mandates. Pair with R&D subsidies for tech like E/F, but pricing drives scale. A ignores science; B adapts to damage we can prevent. C minimizes total costs while achieving deep cuts, key for global buy-in.

Kimi K2.5

Vote: Net-Zero with Carbon Removal Decarbonization plus

Humanity must pursue Net-Zero with Carbon Removal as the primary climate strategy. The science is clear: limiting warming to 1.5°C requires reaching net-zero CO₂ emissions globally by mid-century, and we have already emitted enough to make some degree of carbon removal unavoidable. This approach acknowledges that while rapid decarbonization of energy and transport is essential, certain sectors like aviation, agriculture, and heavy industry will have residual emissions that cannot be eliminated with current technology. Relying solely on decarbonization (Option E) ignores the hard-to-abate sectors and the overshoot risk we already face. Carbon removal—whether through reforestation, soil carbon, direct air capture, or enhanced weathering—provides the necessary margin for error and allows us to address historical emissions. This is not an excuse to delay decarbonization, but a realistic complement to it. Other options fail on viability or urgency: Adaptation-only (B) surrenders to catastrophic warming; Market-based solutions (C) move too slowly without regulatory guardrails; Degrowth (G) is politically infeasible and unjust to developing economies; and Geoengineering (H) carries existential risks and moral hazard. Net-Zero with Carbon Removal combines immediate emissions cuts with the insurance policy of negative emissions, aligning with IPCC pathways while remaining technologically and economically achievable.

Claude Opus 4.6

Vote: Net-Zero with Carbon Removal Decarbonization plus

Net-Zero with Carbon Removal represents the most comprehensive and scientifically grounded approach to climate change. Here's why: First, the science is clear that we need to reach net-zero emissions to stabilize global temperatures. Decarbonization alone — while essential — is likely insufficient given the carbon already accumulated in the atmosphere and the practical difficulty of eliminating 100% of emissions from sectors like agriculture, aviation, and heavy industry. Carbon removal technologies (both nature-based like reforestation and technological like direct air capture) are necessary complements. Second, this option implicitly incorporates the best elements of several other approaches. Achieving net-zero requires market mechanisms (option C), government regulation (option D), and rapid technological deployment (option E). It's not an either/or — it's a both/and strategy that uses every tool in the toolkit. Third, unlike adaptation-only (B), this approach addresses root causes rather than just symptoms. Unlike degrowth (G), it doesn't require a politically and socially implausible contraction of the global economy, which would disproportionately harm developing nations. Unlike geoengineering (H), it doesn't gamble on untested interventions with potentially catastrophic side effects, though it doesn't preclude researching them as a backup. Finally, option F aligns with the consensus of the IPCC and virtually every credible climate roadmap (IEA Net Zero by 2050, etc.). The combination of aggressive emissions reduction plus carbon removal gives us the best chance of limiting warming to 1.5-2°C while remaining economically and politically feasible. The key challenge is speed — we need to scale both decarbonization and removal technologies dramatically within the next two decades. But this is the path most likely to succeed without unacceptable trade-offs.

Final Summary

The AI Roundtable reached a near-consensus on Option F, with six models arguing that halting new emissions is no longer sufficient without actively removing legacy carbon. This dominant bloc was challenged by Grok 4.1 Fast, who championed the efficiency of market-based carbon pricing, and DeepSeek V3.2, who advocated for a pure, rapid technological sprint toward decarbonization.

No agreement after 1 rounds of discussion. Final vote: Net-Zero with Carbon Removal Decarbonization plus: 6, Rapid Tech-Led Decarbonization Aggressive transit: 1, Market-Based Action Use carbon pricing and market: 1

Strongest Arguments

• Net-Zero with Carbon Removal Decarbonization plus: Science indicates that emissions reductions alone cannot stabilize temperatures due to historical carbon stock and hard-to-abate sectors like aviation and heavy industry; carbon removal provides a necessary margin for error.
• Rapid Tech-Led Decarbonization Aggressive transit: Rapid tech-led deployment is more actionable than complex removal schemes, leveraging existing innovations in renewables and EVs to drive down emissions cost-effectively while maintaining growth.
• Market-Based Action Use carbon pricing and market: Market-based pricing is the most efficient method to internalize the cost of emissions, proven by empirical successes like the EU ETS which reduced emissions by 35% without destroying GDP.